9v battery terminal blanks?
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From: Peter Hucker on 17 Dec 2008 14:46 On Wed, 17 Dec 2008 04:03:52 -0000, Spehro Pefhany <speffSNIP(a)interlogdotyou.knowwhat> wrote: > On Tue, 16 Dec 2008 21:38:29 -0600, the renowned jakdedert > <jakdedert(a)bellsouth.net> wrote: > >>DaveC wrote: >>> I want to keep some NiMH rechargeable 9v batteries in my tool bag (well, my >>> meter bag, actually). I am currently running a double loop of electrical tape >>> around the entire battery to insulate the terminals. >>> >>> I'd like to use something more durable (one battery has had a terminal peek >>> through the tape) and was thinking about something like a battery terminal >>> connector but made of insulating material like nylon (probably of some >>> cheaper plastic). >>> >>> Does such a thing exist? I did web searches, but maybe my terminology isn't >>> spot-on... >>> >>> Ideas? >>> >>> Thanks, >> >>As Michael pointed out, the same caps that Duracells ship with are >>available in aftermarket. Personally, I just use a piece of gaffers >>(duct) tape, line the cells up--terminals down, adhesive side up--then >>fold the tape down over the sides. That's enough to keep them from >>shorting together. Put in a drawer or box, they won't short to anything >>else. >> >>YMMV...the goo from the tape is sometimes an issue. >> >>jak > > Now if it's AA/AAA/CR123 cells you want to protect, there are nice > little soft plastic snap boxes available that work fine. Dealextreme > sells a set of 3 4-cell AA boxes for < $2.50. Pricey for a few bits of > plastic, but that includes worldwide shipping. I use them for NiMH AA > cells. You often get them for free when you buy a set of 4 cells. > > Just out of curiosity, what are you using that requires a 9V > rechargable battery? Something special? Most occasional-use meters and > such like are better off with a 9V primary cell because of the low > self discharge rate of primary cells compared to NiMH. The new type (eg. Uniross Hybrio) of NiMH have a very low self discharge. The only problem is certain devices like smoke alarms not liking the slightly lower voltage. -- http://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com _.-"-._ _.-' `-._ _.-' `-,-"-._ |-._ _.-'" `-._ _.-"-._`-._ _.-' `-,-"-._ _.-' `-._`-._|-._ _.-'" `-._ _.-' `-._| `-._ _.-"-,-' `-._ "-._ _.-| _.-" "`-._ _.-" `-._ _.-'_.-"-,-' `-._ _.-' `-._ _.-'_.-' "`-._ _.-|_.-' |_.-' `-._ _.-' " "-._ _.-|_.-' `-._ _.-' " `-._ _.-' "
From: John E. on 17 Dec 2008 16:12 > ... and I never ever use rechargables in radio packs. > ROn(UK) Why? [if you wouldn't mind a newbie question...] -- John English
From: jakdedert on 17 Dec 2008 18:35 John E. wrote: >> ... and I never ever use rechargables in radio packs. >> ROn(UK) > > Why? [if you wouldn't mind a newbie question...] See my multiple posts on the subject. For most presentation purposes, the proven reliability of the good old alkaline--fresh out of the box--is superior. One less thing to worry about in a complex and demanding environment. The cost of having a show 'go down' is much more than that of fresh cells...especially if the cost is losing your job. jak
From: Dave Plowman (News) on 17 Dec 2008 19:08 In article <0001HW.C56EAB4200C5FF44B01AD9AF(a)news.sf.sbcglobal.net>, John E. <incognito(a)yahoo.com> wrote: > > ... and I never ever use rechargables in radio packs. > > ROn(UK) > Why? [if you wouldn't mind a newbie question...] My answer would be is you can virtually guarantee the performance of a decent make alkaline. And I sometimes use a great deal - my personal record for number of radio mics is 38 at once. It really is rare to get a faulty battery. Trouble with rechargeables is they don't maintain the same performance throughout their life - which makes knowing when they must be changed rather hit or miss. Plus the fact that most give little warning of running out - unlike an alkaline - due to the different voltage discharge curves. So what might be a benefit on a high power demand device like a drill etc is a liability on a low current one. Of course if you know they will only be used for a short time - like say a church service - rechargeables can and do make sense. But this isn't usually the case for film, TV and conference etc use. -- *Do infants enjoy infancy as much as adults enjoy adultery? Dave Plowman dave(a)davenoise.co.uk London SW To e-mail, change noise into sound.
From: Lostgallifreyan on 17 Dec 2008 20:20
"Dave Plowman (News)" <dave(a)davenoise.co.uk> wrote in news:500f576701dave(a)davenoise.co.uk: > Trouble with rechargeables is they don't maintain the same performance > throughout their life - which makes knowing when they must be changed > rather hit or miss. Plus the fact that most give little warning of running > out - unlike an alkaline - due to the different voltage discharge curves. > So what might be a benefit on a high power demand device like a drill etc > is a liability on a low current one. All of which makes perfect sense - in the context of a NiMH or NiCd. As most of this talk has gone to discussing microphones, consider a moderate steady load. You want that to be supplied with equal constancy, if possible. If nothing else you know what you'll get during the discharge if it IS constant in voltage and has adequate current. Lithium ion cells do this fine. They fall off at the end but not so fast as Ni-based cells. Actually the fade time at end of discharge when powering a microphone should be fairly long, you'd get early warning if you knew what to look for. You might still get a couple of hours of use from start to end of fall anyway, if current demand is less than 50 mA (examples below), given two CR123A cells. Total use is more than a half a day easily, even with the lower 800 mAH capacity. With light loads the safety is very good. Newer batteries even have the clout to power a drill, if they have lithium titanate anodes. Their shelf life is actually BEST at around 40% charge so they don't mind being left waiting around, and they can be charged at any time. They store very well when cold so they won't mind travel in an unheated truck. They work fine at sub-freezing temperatures too, so long as you don't go too low, and not many things demand that of them in use. Time to running flat is long enough to give you the nice early warning you can expect from alkalines, but is flatter for longer, before that happens. And when you've charged them many times, the loss of capacity even after hundreds of charges and a couple of years of use, will still give you better performance after a charge, than an alkaline fresh out of the box. If you charge them each night they'll probably never run flat, and as they'll spend most of their lives at around 40% charge, give or take 40%, they should last a long time. If reliability is critical, run their first couple of charges in a non- critical situation. Label them with coloured electricians' insulating tape to code them, or whatever it takes to identify and organise. If I had to put batteries in 100 microphones I'd rather use lithium ions than alkalines given what I've seen of them so far on similar steady loads in critical situations (hours in cold and darkness with a flashlight making the difference between safety and injury). http://web.telia.com/~u85920178/tx/bug.htm http://www.zingsmusic.com/product_info.php?products_id=4483 (Two different systems, same 30 mA supply current, so I'm assuming it's a good guide). That said, this one takes 50 mA.. http://www.shure.com/ProAudio/Products/WiredMicrophones/us_pro_104c_ug |